School buses were designed to be the safest mode of transport for kids, so why don't they have seatbelts?

The question comes up often: If cars and trucks have seat belts, why not the buses carrying some tens of millions of kids each day?

When a school bus in Chattanooga, Tennessee, slammed into a tree in November 2016, and killed six elementary school students, a decades-old debate resurfaced: Why don�t school buses have seat belts, and would seat belts actually make buses safer?

if you'd like to read the whole article and the school bus safety history:

http://www.citylab.com/commute/2017/01/why-the-school-bus-seat-belt-debate-lives-on/514370/